Crystal Palace will check on Owen Garvan ahead of the visit of Peterborough.
Midfielder Garvan started his first game in four months at Millwall on Tuesday night following a knee injury and boss Ian Holloway wants to be certain he can cope with a second match in five days.
Jonny Williams, who has also recently shaken off a knee injury, could come in for Garvan if he is not passed fit.
Otherwise Holloway may stick with the side which battled to a goalless draw at The Den, knowing the same result will guarantee them a play-off spot.
Centre-half Paddy McCarthy is still out with a groin problem and full-back Jonathan Parr is also on the sidelines due to ankle ligament damage.
Mark Little and Danny Swanson are expected to return from injury to give Peterborough a fully-fit squad.
Little suffered a setback in his recovery from a hamstring injury in the build-up to last Saturday's visit of Sheffield Wednesday but the right-back's fitness has improved this week.
Midfielder Swanson also missed the Owls match because of a knee problem.
His return would not necessarily be at the expense of teenager Shaquille McDonald, who was a surprise inclusion on the bench last weekend.
"Shaq was outstanding in training last week and he deserved his chance. I'd have no hesitation in picking him again," said Posh boss Darren Ferguson.
Peterborough, above Barnsley and outside the relegation zone courtesy of a better goal difference than the Tykes, will secure Championship football for a third successive season if they match the south Yorkshire club's result at Huddersfield and Wolves' result at Brighton.
The 36-year-old full-back, capped 44 times by the Republic of Ireland, made his professional debut at Spurs as long ago as 1993, alongside the likes of Gary Mabbutt, Vinny Samways and Teddy Sheringham.
Carr first announced his retirement in December 2008 at the age of 32 after failing to find a club following his release from Newcastle, but was persuaded to reverse that decision by Birmingham in February the following year.
He went on to make over 100 appearances appearances for Blues, and as captain led the club to a ninth-placed finish in the Premier League in 2010 and Carling Cup glory a year later.
However, Carr has now gone into retirement for a second time after admitting defeat in his battle against a long-standing knee problem.
"I am going on 37 and now is the time to bow out," Carr told the Birmingham website.
"I felt okay in pre-season but my knee just crumbled away.
"Three operations in 18 months basically told me it had had enough. It just wasn't meant to be in the end.
"The fans have been brilliant with me since I came in and I have had a great relationship with them.
"I will never forget that day lifting the cup. It was a big, big thing for me."
Burton forward Calvin Zola is expected to be fit for the crunch encounter.
Zola, who struck two goals inside the first half an hour in the Brewers' 3-2 win at Valley Parade, was replaced by Billy Kee in the 67th minute and his fitness will be monitored.
Zola returned to the starting line-up as a lone striker and manager Gary Rowett could be tempted to recall Kee, Matthew Paterson or Michael Symes alongside him for the home leg.
Rowett has no other new selection worries, but is still without midfield pair Lee Bell, who sits out the third game of his four-match ban, and Jack Dyer (ankle ligaments).
Midfielder Adam Drury, on loan from Manchester City, and defender Aaron Webster are both in contention to return.
Bradford defender Andrew Davies will return to contention following his one-game suspension.
Davies missed the Bantams' 3-2 first-leg defeat at Valley Parade after being sent off in the last match of the regular season against Cheltenham.
Manager Phil Parkinson must decide whether to recall Davies to the starting line-up or stick with Rory McArdle and Michael Nelson in central defence.
Kyel Reid will continue to be monitored as he manages an on-going groin problem. The winger stepped off the substitutes' bench and played for just over half an hour in the first leg and suffered no initial reaction.
Parkinson, who has no other new injury or suspension problems, has the option of recalling the likes of midfielder Nathan Doyle, winger Zavon Hines and defender Carl McHugh, but is not expected to make too many changes as his side look to overturn a one-goal deficit.
